“require_tree argument must be a directory” rails 3.1.1 precompile assets

Question

I\'ve been round and round here with trying to get the assets to pre-compile on my production server (straightforward ubuntu install with ruby 1.9.2 and Rails 3.1.1, and tried 3

Answer 1

require_tree must be given an existing folder, but git doesn't store empty folders, therefore when you deploy on heroku, those empty folders doesn't exist.

one trick is to add an empty .keep file to the folders you want to keep.